g_dbus_proxy_get_property: use accessors for all mutable state
g_dbus_proxy_get_property: use accessors for all mutable state

These ought to have thread-locking, and having it in the accessor seems
better than duplicating it here.

Signed-off-by: David Zeuthen <16a4bae6a7afea1fdd75baca6404fe68f285db96@redhat.com>

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